#include <iostream>
 
int removeodd(int arr[], int arrsize)
{
  int di = 0; // di == destination index
  for (int si = 0; si < arrsize; ++si) // si == source index
    if (arr[si] % 2 == 0) // even number => copy it
      arr[di++] = arr[si]; // assign arr[si] to arr[di], then increment di
  return di; // "size" of new array
}
 
int main()
{
  int size = 8;
  int ary[8] = { 1,2,3,6,7,9,5,8 };
 
  int newsize = removeodd(ary, size);
  for (int i = 0; i < newsize; ++i)
    std::cout << ary[i] << ' ';
 
  return 0;
}

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